Reply by Clint Searl

Coats after the first will combine with it and polymerize faster than the first, and that causes the streaking. The fix is to slow down the chemical process, and one way is to add a little pure tung oil to the poly mix for second and subsequent coats.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been